The main conversation's tool row head is a 16px leading slot with the
tool-kind glyph at 14 (GenericToolCard's variant table), swapped for an
error StateDot on failed rows. Mirror it: bash/pwsh -> IconApiOutline14,
read/web_fetch -> IconBrowseOutline16, edit/write -> IconEditOutline16,
grep/glob/web_search -> IconSearchOutline16, anything else ->
IconSparkle16, all from the ui-primitives module seed; CollapsibleRow
gains the matching icon slot. Thinking/injection rows keep their bare
chrome (the host's equivalents are a different row family).
Menghuan1918
a48459c5de